Graphite Electrodes

Graphite electrodes are used for the recycling of steel in the electric arc furnace industry, so called "mini-mills." We do not simply provide graphite electrodes and connecting pins as standalone products to our customers. Rather, the focus is on the delivery of an entire "product system", supported by sales and technical experts from the receipt of the customer's order, throughout the entire production process, to final consumption in the steel plants.

Super long Graphite Electrode:

In the past the maximum electrode length supplied by SGL Group was 2,900 mm. SGL Group’s new fully integrated graphite facility in Banting (Malaysia) is capable of producing electrodes up to a length of 3,800 mm. The “super long” graphite electrodes provide the following advantages for each customer:

Less jointing due to longer electrodes - therefore fewer joint issues

Decrease of electrode jointing time due to fewer joints leading to increased productivity

Less electrode columns in parking position will yield less oxidation and graphite losses

Lower production costs resulting from increased number of heats between electrode additions

Graphite electrodes from SGL Group are designed for increased productivity and customer value. Our continuous improvements in material properties as well as increased dimensions provide the customer the benefit of applying higher current loads.

Graphite Electrode Dimensions

Nominal-Diameter

Full Tolerance

Nominal Length

Lower Tolerance

Upper Tolerance

mm

Inch

min.

mm

max.

mm

min.

mm

max.

mm

mm

Inch

350

14

352

355

355

359

1500, 1800,2100

2400

60, 72, 84

96

400

16

403

406

406

409

1500, 1800,2100

2400

60, 72, 84

96

450

18

454

457

457

460

1800, 2100,2400

72, 84, 96

500

20

505

508

508

511

1800, 2100,2400

2700

72, 84, 96

110

550

22

556

558

558

562

2100, 2400,2700

84, 96, 110

600

24

607

609

609

613

1500, 2100,2400

2700

60, 84, 96

110

650

26

657

660

660

663

2100, 2400,2700

84, 96, 110

700

28

708

711

711

714

2100, 2400,2700

84, 96, 110

750

30

759

762

762

765

2400, 2700

96, 110

800

32

810

812

812

816

2400, 2700

96, 110

SGL Group electrodes and nipples are machined according to internal standards (derived from international standards IEC 239, NEMA, JIS).

Length Tolerance

Nominal

Full Tolerance

Lower Tolerance

Upper Tolerance

mm

Inch

min. mm

max. mm

min. mm

max. mm

1500

60

1400

1510

1511

1610

1800

72

1689

1790

1791

1915

2100

84

1969

2095

2096

2220

2400

96

2273

2399

2400

2525

2700

110

2526

2704

2705

2906

Typical Properties of Graphite Electrodes

Diameter

SIGRA-LF

MELT

mm

350 - 450

350 - 450

500 - 650

700 - 800

inches

14 - 18

14 - 18

20 - 26

28 - 32

ApparentDensity

g/cm3

1.63 - 1.72

1.66 - 1.76

1.67 - 1.77

1.68 - 1.77

Specific ElectricalResistivity

μΩm

4.9 - 7.5

4.9 - 5.7

4.5 - 5.5

4.0 - 5.5

FlexuralStrength

N/mm2

9-15

8-13

10-13

10-13

ThermalConductivity

W/(K.m)

160 - 210

220 - 270

250 - 280

250 - 300

Coefficient ofThermalExpansion

μm/(K.m)

0.7 - 1.8

0.3 - 0.7

0.3 - 0.6

0.3 - 0.6

All values measured parallel to extrusion direction. Graphite electrodes from SGL Group are produced with a high degree of purity so as to have no adverse effect on the refining of steel.

Mechanical Joining Procedure

A sufficiently high and well-defined torque is essential to ensure the proper performance of the electrode joint. For diameters exceeding 450 mm / 18 inches, mechanical joining with torque control by a hydraulic assembly station or robot joining is highly recommended.

For details please refer to the brochure in the download section or contact directly the technical service responsible.